First Pb-Pb measurement of heavy-flavor electron-charged particle azimuthal correlations shows a near-side low-pT enhancement hint (1.27 sigma) and an away-side high-pT suppression (2.5 sigma) in central collisions.
Angular structure of the in-medium QCD cascade
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abstract
We study the angular broadening of a medium-induced QCD cascade. We derive the equation that governs the evolution of the average transverse momentum squared of the gluons in the cascade as a function of the medium length, and we solve this equation analytically. Two regimes are identified. For a medium of a not too large size, and for not too soft gluons, the transverse momentum grows with the size of the medium according to standard momentum broadening. The other regime, visible for a medium of a sufficiently large size and very soft gluons, is a regime dominated by multiple branchings: there, the average transverse momentum saturates to a value that is independent of the size of the medium. This structure of the in-medium QCD cascade is, at least qualitatively, compatible with the recent data on dijet asymmetry.
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Medium-induced modification of azimuthal correlations of electrons from heavy-flavor hadron decays with charged particles in Pb-Pb collisions at $\sqrt{s_{\rm{NN}} = 5.02}$ TeV
First Pb-Pb measurement of heavy-flavor electron-charged particle azimuthal correlations shows a near-side low-pT enhancement hint (1.27 sigma) and an away-side high-pT suppression (2.5 sigma) in central collisions.